Acetylene-blowpipe.



1; w. & EQH. SMITH.

ACETYLENE BLOWPIPE.

APPLIC ATION FILED JUNE I6, 1913.

Patented Sept. 7, 1915.

NIT/YE J65 es 77x 7- pan era OFFICE.

: JOHN W.-SMITH AND ELIVIER- H. SMITH, OF MINNEAPOLIS, MINNESOTA."

To all whom, it may concern:

Be it known that we, JOHN W. SMITH and ELMER H. SMITH, citizens of the United States, residents of Minneapolisfcounty of Hennepin, Stateof Minnesota, have invented certain new anduseful' Improvements Acetylene-Blowpipes, of which the following is a specification.

In the use of a blow pipe of thistype for cutting metal, it is customary after heating themetal with the acetylene burner to a l a stream of oxy en for cutting the nieiiai It has been fou id difficult to move the blow pipe or torch at a suitable speed over the metal and a speed that may be varied according to the thickness of the metal to be cut.

The object of our invention is to provide a device for moving the'blow pipe through the pointed out in the claims.

In the accompanying drawings forming part of this specification, Figure 1 is a side view, partially in section, of an acetylene blow pipe embodying our invention, Fig. 2 is a plan view of the same, partially in section, Fig. 3 is a transverse sectional view on line a2a2 of Fig. 1, showing the means for operating the feed mechanism of the torch by the pressure of the oxygen.

In the drawing, 2 represents the handle of the blow pipe, having the acetylene supply pipe 3 and oxygen supply pipe 4. These pipes we have shown broken away in Fig. 1 to illustrate more clearly the pure oxygen supply pipe by means of which oxygen in any suitable pressure is supplied to the nozzle when it is desired to cut through the metal.

5 represents the pure oxygen supply pipe and 6 a valve inserted therein having an operating lever 7 within convenient reach of the handle 2.

8 is a casing, preferably of metal, having a cover 9 provided with a gas-tight joint 10. This casing has supporting wheels 11 mounted on a shaft 12 which has bearings in the walls of the casing and provided with gas tight joints 13. A gear wheel 14 is mounted on the shaft 12 and meshes with a pinion 15 Specification of Letters Patent.

hpplicationfiled June 16, 1913. Serial No. 773,979.

, tlon. Evidently,

ACETYLENE-B-LOWIBIPE.

Patented Sept. 7,1915.

on a shaft 16 which supports a gear wheel 17. pinion 18, mountedon a shaft 19, meshes with the gear 17. A wormwheel 20 is mounted on the shaft 19 and is driven from a worm 21 onwhich a fan 22 is mounted. The pure oxygen pipe has tubes 23 and '4 leading therefrom and provided with nozzles which project through the wall of the casing in position to direct the gas under pressure upon the blades of the fan above and below its axis.

A regulating valve 25 isprovided and by means of this valve and thevalve 6 the operator can vary the volume of gas discharged against the blades of the fan and thereby. regulate its speed of revoluthrough the tube 23 against the fan while the flow of gas through the tube 24 is cut off, the fan will berevolved at a high speed. On the other hand, if a portion of the gas is admitted through the tube 24: it will act as a brake or a retarding means forv the fan, reducing its speed, and by the adjustment of the valve 25 the operator of the blow pipe caneasily regulate the flow of gas to the fan and thus control the travel of the blow ipe over the metal, according to the thickness of the metal to be out. If the metal is comparatively thick, it will be desirable to move if 511 the gas'is allowed a, How

the torch at a slower speed, while if the cutting is to be done through a comparatively thin plate, then the torch may be operated at a higher speed, and all this may be accomplished by the feed of the gas to the fan through which the supporting wheels are revolved.

The casing 8 will, of course, be made gas tight and at one end is provided with a port 26 leading to a pipe 27 which communicates with the cutting nozzle 28, these nozzles being varied according to the character of the cut and thickness of the metal.

We claim as our invention 1. The combination, with an acetylene blow pipe and a carrier therefor, gen supply pipe and mechanism actuated by the pressure of the oxygen for operating said carrier to move said blow pipe.

2. The combination, with a blow pipe and a carrier therefor, of a pipe for supplying gas under pressure, andmechanism actuated by the pressure of the gas for operating said carrier to move said blow pipe.

'3. The combination, with an acetylene of an oxy-* supporting said pipe, and comprising a closed casing and supporting wheels therefor, mechanism Within said casing having driving connections with said wheels, an"

oxygen supply pipe having pipe connections with said casing, said mechanism including means actuated by the pressure of the oxygen for operating said Wheels, and a nozzle having a pipe connection with said casing.

4. The combination, with an acetylene blow pipe, of a Wheeled carrier therefor and including a casing, a fan mounted therein having a driving connection with the Wheels of said carrier, an oxygen supply pipehaving tubes leading through saidcas ng for directing the oxygen against the blades of said fan, above and below its axis, regulating valves for said tubes, and a nozzle having a pipe connection with said casing.

5. An acetylene blow pipe comprising a handle, acetylene and oxygen gas supply pipes and a nozzletherefor, a pure oxygen supply pipe and a'regulating valve therefor, and means supporting said blow pipe and actuated by the pressure of the oxygen for moving said blow pipe back and forth over the metal to be cut. I

6. A self-contained, mechanically propelled gas cutting apparatus, portable and adapted to travel in any desired direction on an underlying surface, the same comprising a carriage mounted on driving wheels and havinga nozzle, and a gas-propelled mechanism connected with said wheels for moving said carriage and nozzle.

-; A gas cutting apparatus comprising a carriage having supporting wheels and a nozzle, and a driving mechanism connected with said wheels and actuated by a gas under pressure for operating said carriage.

8. The combination, with a wheeled traveling member and ajet delivering means, of

agas propelled motor carried by said member and geared to a wheel thereof to drive the same,-and means whereby the gas ress'ure is utilized to retard the speed o the motor.

- 9. The combination, withablow pipe, bf

a wheeled carrier therefor, a vane mounted thereinand having a driving connection with the Wheels of the carrier, a gas supply pipe having tubes for directing the gas against the blades of said vane above and below its axis, regulating valves for said tubes, and a nozzle having a pipe connection with said carrier. I f

In witness whereof, We have hereunto set our hands this 12th day of June 1918.

JOHN W. SMITH, *ELMER SMITH.

Witnesses: v

GENEVIEVE E. SoRENsEN, EDWARD PAUL. v 

